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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035d6d47d8611c6d858c2e7137aaf6863fa2b612771a55f6ac3cd80370ceca58' 
  AND token = '2d1XcbjxpPrAUdiciSPGWtyz0MvBN1Z9hHFjl/RxJZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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