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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe66141c5379c94e99e27c4d3ef3f8d9b28e2f9ad1960074ca8323e31a8c8a58' 
  AND token = 'bKQ0JZMdeS7JuPFbtzgPpQEkUA9o91o8IWEmXKKMrHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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