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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '091073196ec0b0430a0a18d36696616da40610540cd74cbb5e66f3473ef4fa9a' 
  AND token = 'bX1CNvZ8khMWCuUv20D/ta38+qPKb0bUAaD/BXx5wu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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