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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fbfeb5281cd5dbe675ec74c371b1747db2f69238938d04bfe8f997e1a4e9e5c' 
  AND token = 'SmpGtAwQECAeipIw5Sdl4tnrmjfWyGGTTggcD3KyRy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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