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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ac09c5628e4d8478734b153d4c73a8ce8b045b8a9536ba01e8d25bb1420ee9b' 
  AND token = 'SZ8GSxwbLtGAyW5T7dYvamvpQIq3TPBnpLLdQ1fWmOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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