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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2889c577ad7e6448c966abc9bb9ecba05fc598029b81bb933f7a9db463c7319c' 
  AND token = 'AG5PvUT8+les+5wwys63v2JOLqoGHJamPNb1icWAfX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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