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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda7803c8d0f8e9a1ce8d9e7b3edb9e744f6cd75d614d0424bb08fc40c8cba81' 
  AND token = 'vjvtqvnpaliS91i8PuLyXarA2Cxo6QXeEcQGflb6C2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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