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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6abeca98a2f9671de7a03436f6191b6f32f5620ce3bdae600a30c59480d5eba' 
  AND token = 'JDuXfmNsOuV66I5SLDn7hR+69Q8NGquJzMkYoW09kIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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