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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a36dc4c87c26bd1a49db9dad195e34308d7988493c85ba20b867d2088e12e8' 
  AND token = 'L65xj6itk9LWRV/tUdI1F6ZnQOUnNKY1Z4qM7utNSw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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