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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d59e49d2854514b799f6922ae2f218481b66814121af35568e4d4247c67e70' 
  AND token = 'k2JTwHnO3WX1cav1QjK5wF4wSAjfOBr/aKjSFgly1tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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