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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1be63417d41a70ad70ce29f90b34fe01a78c13439148e9aa7709bf765d630412' 
  AND token = '/riK/VGxU9G7lN16T86YMV7j/1bEX5tr/RHfy2/7YdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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