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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3139de01f9226fb0cd1c54f5f83e86bd3081677fb348656cdb944eed19783a00' 
  AND token = 'am4p1xu+Ypzddv/L8o33YPOA3Y5EbwQSA0TqJngP/Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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