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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a16ed16f7e0a89aecaed3217fb2e6468067ee71f47a36b2522dc54ddf8e70a0' 
  AND token = 'jdu6t1jPn8Au9w85pov6baHUygCniQodPbCHaXIomV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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