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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84de4a1cd95fb8debef3acc25837fa453f4e5862637998b9d42044f7d38048f' 
  AND token = 'vopj9j0vNtPjkmgcLJQEUaGo36RyzeSd04Xia4u1G8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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