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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdcf744a54a3e9e17c667fa8c08e0762b68e385820a9a8b58faa237b08ebebd7' 
  AND token = '6ZbQiIIYzBKH2xYfXimhdEMGIP9QWW0Si9Aap2qT1eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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