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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b409fcb95b39de5ddf1e0aff4edf83a03063d84aecad6589eb0602baa56652ce' 
  AND token = 'NxwJX5I2EZvR50H0QSfNw923RJEUqU2qwcwL1YLyhmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00133

JSON explain

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