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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'becfb497f4d3ed31554a9ae2ae735bd7b9bcc6a8dc8afb3bf59695e5ececaedc' 
  AND token = '7J2ydbI7pGsrFOHLuHZsZz9Wikf7yut6UrXNmw/+7bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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