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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dd092cc4ebfdb90576f941c1a604dacfb45242ce23d37d907ed2d5c3d85f483' 
  AND token = 'xY+az0wCWyUkb61eZM14tyCyM69fTggkqbNg9Kb1YpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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