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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79fd6a9da6053d17c55bd6a7a6aa0310236b6544d3e73fccbfa88474640da27b' 
  AND token = 'T4UGUJYhdwm5p24aGRVcaXjB9yM8h7K9JmqaZwf0JaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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