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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0950e6bc2b1429cf85367e896076f2c059137df6a752b5f9dbe72fe5243254fb' 
  AND token = 'ebogzAuO2YK7dbwoBArnO1C8i+zmaEBgqUuaWKw6ZQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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