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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc825512369b96d3c8c31c002fbc41f11a609e04f285dfa3710b602a7d858805' 
  AND token = 'FlkBf+fYcKqgdTA1Rxf6eE/GmruF9pcOaJJ0atoZC5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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