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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ff3f04b4da811bc69d30c35db55ed8bdf5a6ca0c253f2694200d24baf7c6fdb' 
  AND token = 'ONptExkc1n5CGUvvdXLtqX/OJpM78xAWUHuW/+pY26E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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