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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd99e4d4c1f5f59368808c9f64247d43c43b1da4a04522884d36e0d64e5249da' 
  AND token = 'YwqCrUwOwxO7fFhbkPXUAEXfZyVZzcaESzZYpvW5FXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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