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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc962a6a0d3d5ed787f2c53f47c40412e9a5cd8f5f84d386cf9ae5f760d24d47' 
  AND token = 'gEg3MjP+rP5OjLIbBrsGtk1QDtElCVTkiQdNUCoyEjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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