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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23533067efdff00a240cca3ee53ea7e52b3fd77b4b4a796331aefcc6b4b102b' 
  AND token = 'OJ6OFUAb8ihQQ6tGjQdxhEcYBV6Nzk5XtZHIfVJ9rBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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