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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7906c54ffd3285a9e532d187f34e5235bf59ce194ab389a9b633ca53b76c4b8' 
  AND token = 'C6yGVujYgYUcK0Uy0al76Swramj+RWlNIAdEAJ8T9tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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