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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7cc5f42394125287244061714801b7ee256eaf34fc5777456d535e59c7f0d89' 
  AND token = 'WM+DqqbKmLZvBh4eorsytDfcIO4vMEsRNpcQ9+ywzUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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