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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c94e38fe5f10afd0c79d1891c07765aed5efcd97796343abd8223040eb70b2fc' 
  AND token = '9z9CFs0OQ1ydkJ64YhC3Jm3kr1C9OuJfowXQ3lHvKc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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