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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0af18b4575aec97e60a6a50192ed0cb09064cb520a3c1389993b9e68098eef7b' 
  AND token = 'DM8MRnHnU7hUYOdLmeIAUbOxx+gp1ARA9l8wDgq5w0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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