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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '905abff190bdd030a064a9d7f25d020506a3a9f980d4693757054d6fd332c93e' 
  AND token = 'nupVQQazd3gWv18Uintqcw7V3jKg6Uq8nBSv9ind73M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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