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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900fbde02d46871daed9303b1e3b443da0e6e1bb5961f05c2cc6a7cda18a5cca' 
  AND token = 'RgAsCZecvRrUi4sL51O9ay1RvEANJBgIhBYQK92MgW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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