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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb4a946de3109a5206db010efef91ad11886e8532f34c6fac9cc20409244008' 
  AND token = 'keg9TGhkXuM2xaG1ZYVtsR8P3/IZHjJ0NTw9UvLERWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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