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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b8a8e86924c10b89c5b129ecf96b1e91ec8669e6096f19b6ea7e0381cf1c564' 
  AND token = 'mM/Khxc07WHNQNMrBIJGnZ71XxY9iKXGIxWgH6EnHZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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