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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '211eb08840584d0e742e67ecf717517cb672da1532373f9de1b21b33dc475f1e' 
  AND token = 'eKSmi8WUKBZ0yEHdb27pPzty5NO5qsRzeVSaXeIO3Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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