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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1832e1c2c41d1f77eecc28c29d96cc233239cc1b26a4001a3acb03b09a4ce9dd' 
  AND token = '6ABMYE1+8oIuf5oBEd0+kd6mw0d/DF91c2UHyu/Z4Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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