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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12aa6980f4d8887ac6762ac81eb8ec603f67ffa6ce1c8a43c401ed645d6807d6' 
  AND token = 'UXBh4zUTL6plS/VozSukNfabUrBtvuNzVoan8Q6bG/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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