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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a417693f62ae9d0d22cbc104b55c83967035c1e3bad61a7daf527ea7fad787' 
  AND token = 'TFg59pbKyf5DdmuaajFI36cHNqF/2GNHVUpb7ohMnK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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