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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7eeeb1d13c04f893335caae1bda6a3e6c4111169e2c5904d021ff54ca0be9f8' 
  AND token = 'xWWJV7LS6DY8z1DxNmLfjeiSbOdETw0JwBPVYpgrAR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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