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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee9e6583f4e1fb8dc29e9538a860911172cd02052470eb1c93badb9ef4ccb8c' 
  AND token = 'rtHYyKrRR6ZlS+og0jWVIsl1sNV3hFHbo8iCpSL4WBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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