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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1efe416f3043e7c22717d0624d2b2174e4b889790cd57457d77cac75cf27e271' 
  AND token = 'zqIhYagln4y1W5IByRrF5NF2Mk/Z7cxolxfJboCHGZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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