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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d5a7f5c79bfb7f9baf219ab1ec744494e28c6ef60b3860f39ce6c1715db5b2d' 
  AND token = 'KfJRInvjK5ZvJ+wVafaM1GOE+rJur/zfSye4eO5a9kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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