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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f337c1e002fb7b7f78c47a73061b2b6a8b97a97ef4cb3d7cf2ab8b41c90575a9' 
  AND token = 'Jh81YQuRHC21YLA07f8MqaI+EugfnQ8Mi9Rl+I9J4CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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