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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd67baca72b2b1f4e920230ba3bf2139243672cd402f6efd8ddb989b94cfd60ff' 
  AND token = 'tBgrc6swQwtQCyw75c8wdIoI52w9K8/P81qXencuJDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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