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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78b956f59c5df4e9e979cd135980b1ec586b5c548e374528ed0e7e72dcbee4c3' 
  AND token = 'gsbFGRyXuJ7dW8s1Xb8RxGcb9Jkb3QvgqKPQ+/g3e18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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