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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c4fdfdf285b889fc155f35ff6b3abf3113ceb2d6b9834573f82ff1e38ddc64e' 
  AND token = 'SFOL4YIJmoh4u9D4hBaXY0KAey7Y7arSxZoo8obNMlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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