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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f97d0b9539b707552e40ce18dac588a913df59551c463cb1a93502bbd5ac6f5' 
  AND token = 'kJh9IlT6l4k7Z3oGK/Was5dbjMCjpaeVO4prX+A+Qzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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