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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a613520c094c9a5326029a468a5dc37c3da23860d56231557e20b98347f13b91' 
  AND token = 'HIBWJ5dDYqdQu2z9IvYT/egUTk44CHToubK54QA+AqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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