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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b613fa17741eb3648e7d4d6aa0db52181719a3dae54350a287ea46dbb6b498b' 
  AND token = 'TV6hTGfsvQhr5SNlBjBmnm6FO0AENChEbeyD1CcH9N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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