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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c9bf6bf0e0d7e56216aee2b7604aa836674024c80ac5f1b5f83bf3f7af37230' 
  AND token = 'poRBjyReqPO6ZBckynSrqZQiNECRFlz8maVPth2ofKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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