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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56bfbf04503cb1d41ed31bd06a71ca0d2aa3699054d8e6fa1a512ceff79909c' 
  AND token = '054aLwly4ezFYc19430QhJEi2LwJI4HduUXegdgWciA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}