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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3170892a58d7bd17d8fb94f240433f01f2bcfeb2cfdf0115cb30f45ed2fbfa8c' 
  AND token = 'dxHItaLfktx2HjpO7Mqf6tvI3UfglLkB8jXpnUxjZEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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