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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ccdb252fc48bf19e7050984a6c36caedeed269b20869ac3b27fb46c7c191085' 
  AND token = '7j6+Xbz00S+mDOvs5ENFU59aZqz32CurXhl+CQFKvo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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