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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08dd5b36ba90ab9ef2b4bf8cfa85c32906eeabc46a42777978ae9e76ed951571' 
  AND token = 'EuvMZCfPUQXO9kf8QwRUTJX1zfojDAtcD3jqz1MQObU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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