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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c25175021bfaf8b06a96c77b72113b288cd586c3cc282c21681512739e7934b' 
  AND token = 'qGyvHzBdwJEpjfV5YPojMFrXT03H7r0mTUP0nOwmx2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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