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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf70f85c5d52f2cae2612cf74c5cbc315ab727a544a99cb3b625ca40a27a7f0c' 
  AND token = 'csejHSISytDFDUmYmYxmgQTjIQ2ATud53t3pEym88l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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