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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07cd974ca896b53bc723bb78f5bce697fa08252904a194298ca915367e9af76' 
  AND token = '2i+iyadDlFqFnaU9trqr/XqwdHEHkoONeEZCUJewj+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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