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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f1a3efe47247d0a750e931e720a4eba161ef5041ab89cedab17464451213e27' 
  AND token = 'vo98WpSBL13n5ptHMK2QPcK2Smsv9n+CN4U0ASKaKlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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