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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad30da52799897c9d1be7226ab3d67d5f8c4475c7ed599c12db155d365900a1e' 
  AND token = 'Sv4K81cw5QOz/ifjlcvPkMQ7754ldnL701GZ+mFw+YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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