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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6c9fddc2677f12e085e27a358fd3eb58a6ad8f111a7aeb108cdb8e940a383ec' 
  AND token = '4cd1Er3OAMiHyaU1WQUuI/ZLIudm/LRkd2ZNA4hpGWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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