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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b5031cc551e2bdf5183eef84290152d2d1d91e5361680f6b63e0d27b6efc64' 
  AND token = 'cXhXdpMmILD+A18MwpUz8387MY11VAzOc6xTtCDEYPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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