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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d78ff02b6c3f42530de65d14ade66314414dc1f937ea80c9c6b540dd2eaef05' 
  AND token = 'AKsiBWhv+8YYkyd/4mXynUMxb6IQIT541U4tRa0qwuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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